year | Y (billion) | Predicted value (billion) | relative error |
2008 | 2767.726 | 2590.408 | 0.064066 |
2009 | 2900.533 | 2776.138 | 0.042887 |
2010 | 3197.46 | 3068.92 | 0.040201 |
2011 | 3896.959 | 3716.852 | 0.046217 |
2012 | 4231.038 | 4099.892 | 0.030996 |
2013 | 4712.732 | 4701.812 | 0.002317 |
2014 | 5185.961 | 5178.577 | 0.001424 |